JP2013207708A - Antenna device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact antenna device capable of sufficiently reducing characteristic deterioration with a change in an antenna peripheral structure.SOLUTION: An antenna device includes: a reversed L-shaped antenna conductor 3 disposed vertically on a ground conductor plate 1; and a non-exciting element 6 that is an L-shaped conductor plate disposed in the vicinity of the antenna conductor 3 and the ground conductor plate 1. This configuration achieves a compact antenna device capable of sufficiently reducing characteristic deterioration with a change in an antenna peripheral structure.

Description

  The present invention relates to a small antenna device mounted on a small wireless communication device, for example.

  In a small antenna mounted on a small wireless communication device, the antenna characteristics change depending on the surrounding environment such as a human body or a metal body. Therefore, it is necessary to reduce the characteristic deterioration when the antenna surrounding structure is changed.

As a method of reducing characteristic deterioration due to changes in the antenna surrounding structure, a method of reducing the influence of the surrounding environment by installing a non-excitation element (parasitic element) near the antenna and controlling the radiation directivity of the antenna There is.
For example, in Patent Document 1 below, in an inverted F antenna built in a portable wireless device, in order to reduce the influence of the human body, a non-excitation element is installed above the inverted F antenna, and the opposite side to the human body. A method for directing radiation directivity in the direction of the non-excitation element is disclosed.

  In Patent Document 2 below, an inverted L antenna having a circuit board as a ground conductor plate is installed in a portable wireless device, and a plate-like non-excitation element parallel to the circuit board is provided on the back side of the circuit board. A method is disclosed in which the radiation directivity is directed to the opposite side of the non-excited element by installing the non-excited element as a reflector.

JP-A-8-195609 (paragraph number [0015]) Japanese Patent Laying-Open No. 2004-32242 (paragraph number [0005])

  Since the conventional antenna device is configured as described above, in the case of Patent Document 1, a strong current also flows through the ground conductor plate of the inverted F antenna. For this reason, radiation in the direction of the human body is large, and it is not possible to sufficiently reduce radiation in the direction of the human body simply by installing a non-excitation element above the inverted F antenna. There was a problem that could not be reduced sufficiently.

  In the case of Patent Document 2, since the inverted L antenna is configured in the same plane as the circuit board, the antenna and the plate-like non-excitation element installed on the back side of the circuit board are close to each other, and the radiation efficiency of the antenna is deteriorated. There was a problem to do. Further, Patent Document 2 discloses a configuration in which an inverted L antenna is installed perpendicularly to a circuit board and separated from a plate-like non-excitation element. In this configuration, however, a polarized wave perpendicular to the circuit board is disclosed. Is emitted and its polarization is orthogonal to the plate-like non-excitation element, radiation to the non-excitation element cannot be sufficiently reduced, and characteristic deterioration due to changes in the structure around the antenna is sufficiently reduced. There was a problem that could not be done.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a small antenna device capable of sufficiently reducing characteristic deterioration caused by changes in the structure around the antenna.

  The antenna device according to the present invention is a first linear conductor that is connected to a planar ground conductor plate and a feeding point having one end installed on the ground conductor plate, and is installed substantially perpendicular to the ground conductor plate. An antenna conductor composed of a conductor and a second linear conductor having one end connected to the other end of the first linear conductor and disposed substantially parallel to the ground conductor plate; A planar first conductor plate disposed substantially parallel to the ground conductor plate at a predetermined interval on the surface of the surface opposite to the surface on which the antenna conductor is disposed; One side is connected to one side of the first conductor plate, and the first conductor plate and the second linear conductor are provided with a planar second conductor plate installed substantially perpendicularly. is there.

  According to this invention, it is comprised from the inverted L-shaped antenna conductor installed substantially perpendicularly on the ground conductor plate, and the L-shaped conductor plate installed in the vicinity of the antenna conductor and the ground conductor plate. Therefore, there is an effect that a small antenna device that can sufficiently reduce the characteristic deterioration due to the change in the structure around the antenna can be obtained.

It is a perspective view which shows the antenna apparatus by Embodiment 1 of this invention. A perspective view showing a state where a device 10 (a metal body, a dielectric body, or a device composed of both a metal body and a dielectric body) is installed on a surface opposite to the surface on which the antenna conductor 3 is installed. FIG. It is explanatory drawing which shows the radiation efficiency measurement result of the antenna when the shape of the apparatus 10 changes. It is a perspective view which shows the antenna apparatus by Embodiment 2 of this invention. It is a perspective view which shows the antenna apparatus by Embodiment 3 of this invention. It is a perspective view which shows the antenna apparatus by Embodiment 4 of this invention. It is a perspective view which shows the antenna apparatus by Embodiment 5 of this invention. It is a perspective view which shows the other antenna apparatus by Embodiment 5 of this invention. Of the surface of the conductor plate 35, the surface opposite to the surface on which the antenna conductors 26, 30 are installed, and of the surface of the conductor plate 36, opposite to the surface on which the antenna conductors 26, 30 are installed. It is a perspective view which shows the state in which the apparatus 10 (The apparatus comprised from both a metal body and a dielectric material or a metal body and a dielectric material) is installed in this surface.

Embodiment 1 FIG.
1 is a perspective view showing an antenna apparatus according to Embodiment 1 of the present invention.
In FIG. 1, the ground conductor plate 1 is a flat rectangular conductor plate, and the ground conductor plate 1 is provided with a feeding point 2 for exciting the antenna conductor 3 in the vicinity of the conductor plate 8.
The antenna conductor 3 is composed of a linear conductor 4 and a linear conductor 5. One end of the linear conductor 4, which is the first linear conductor, is connected to the feeding point 2 and is perpendicular to the ground conductor plate 1. is set up. Here, an example in which the linear conductor 4 is installed perpendicular to the ground conductor plate 1 is shown, but it may not be completely vertical, for example, even if it is installed at an angle of about 80 degrees, Similar effects can be obtained.
One end of the linear conductor 5 that is the second linear conductor is connected to the other end of the linear conductor 4, and is installed in parallel to the ground conductor plate 1. Here, an example in which the linear conductor 5 is installed in parallel with the ground conductor plate 1 is shown, but it may not be completely parallel. For example, even if it is installed at an angle of about 10 degrees, Similar effects can be obtained.

The non-excitation element 6 includes a planar rectangular conductor plate 7 and a planar rectangular conductor plate 8, and the conductor plate 7, which is the first conductor plate, is an antenna among the surfaces of the ground conductor plate 1. On the surface opposite to the surface on which the conductor 3 is disposed, the ground conductor plate 1 is disposed in parallel with the ground conductor plate 1 so as to substantially cover the ground conductor plate 1 with a predetermined interval. Here, an example in which the conductor plate 7 is installed in parallel with the ground conductor plate 1 is shown. However, the conductor plate 7 may not be completely parallel. For example, the conductor plate 7 may be installed at an angle of about 10 degrees. The effect of can be obtained.
The conductor plate 8 which is the second conductor plate is installed perpendicular to the conductor plate 7 and perpendicular to the linear conductor 5 so that one side is connected to one side of the conductor plate 7 and substantially covers the linear conductor 4. Has been. Here, an example is shown in which the conductor plate 8 is installed perpendicularly to the conductor plate 7 and the linear conductor 5, but it does not have to be completely vertical, for example, it is installed at an angle of about 80 degrees. However, almost the same effect can be obtained.

  FIG. 1 shows an example in which the feeding point 2 is installed in the vicinity of the vertex of the rectangular ground conductor plate 1. However, if the installation position of the feeding point 2 is in the vicinity of the conductor plate 8, the ground conductor It can be anywhere on the board 1.

Next, the operation will be described.
When power is supplied to the antenna conductor 3 from the feeding point 2 and the antenna conductor 3 is excited, a current flows through the linear conductors 4 and 5 and the ground conductor plate 1 to radiate electromagnetic waves.
In the antenna apparatus of FIG. 1, since the antenna conductor 3 is installed away from the conductor plate 7, an antenna having a relatively wide band and high radiation efficiency can be obtained.

Further, in the antenna apparatus of FIG. 1, the conductor plate 7 is installed in parallel with the polarized wave radiated from the linear conductor 5 and the ground conductor plate 1, and the conductor plate 8 is parallel to the polarized wave radiated from the linear conductor 4. Is installed.
Therefore, the antenna conductor 3 and the ground conductor plate 1 are strongly coupled to the non-excitation element 6, and the non-excitation element 6 operates as a reflector. For this reason, radiation directivity can be directed to the side opposite to the non-excitation element 6 to sufficiently reduce the radiation toward the non-excitation element 6.

In the antenna apparatus of FIG. 1, the length of the conductor plate 7 is P1, the height of the conductor plate 8 is P2, the width of the conductor plates 7 and 8 is W, and the distance between the ground conductor plate 1 and the conductor plate 7 is D1, and the interval between the linear conductor 4 and the conductor plate 8 is D2. Further, the wavelength at the center frequency of the frequency band in which the antenna is used is λ.
At this time, the length P1 + P2 of the non-excitation element 6, the distance D1 between the ground conductor plate 1 and the conductor plate 7, and the distance D2 between the linear conductor 4 and the conductor plate 8 are changed to change the antenna conductor 3 and the ground conductor plate. By adjusting the amount of coupling from 1 to the non-exciting element 6, the radiation directivity can be directed to the side opposite to the non-exciting element 6.

When the width W of the conductor plates 7 and 8 is small, when the length P1 + P2 of the non-excitation element 6 is about 0.5λ, the non-excitation element 6 resonates and operates as a reflector.
However, when the width W of the conductor plates 7 and 8 is large, the length P1 + P2 of the non-excitation element 6 necessary for resonance becomes smaller than 0.5λ.

In the first embodiment, for example, a case where P1 = 0.22λ, P2 = 0.10λ, W = 0.19λ, D1 = 0.010λ, and D2 = 0.016λ will be considered.
At this time, as shown in FIG. 2, the antenna conductor 3 is installed on the surface of the conductor plate 7, the surface opposite to the surface on which the antenna conductor 3 is installed, and the surface of the conductor plate 8. Assume that a device 10 (a metal body, a dielectric, or a device composed of both a metal body and a dielectric) is installed on a surface opposite to the surface on the other side.

FIG. 3 is an explanatory diagram showing the measurement result of the radiation efficiency of the antenna when the shape of the apparatus 10 changes.
In FIG. 3, (1) radiation efficiency when there is no non-excitation element 6 (when there is no conductor plates 7 and 8), (2) among the non-excitation elements 6, only the conductor plate 7 is installed, and the conductor plate 8 (3) Radiation efficiency when the non-excitation element 6 is installed (when the conductor plates 7 and 8 are installed). In FIG. 3, σ is a standard deviation.

It is confirmed that when the conductor plate 7 is installed, the average value of the radiation efficiency is improved and 2σ representing the variation is reduced as compared with the case where the non-excitation element 6 is not provided.
When the conductor plate 8 is installed in addition to the conductor plate 7, it is confirmed that the average value of the radiation efficiency is further improved and 2σ is further reduced.
This is presumably because when the non-exciting element 6 is installed, the radiation directivity is directed to the opposite side of the non-exciting element 6, thereby reducing deterioration of the radiation efficiency due to the influence of the device 10.
Further, it is confirmed that the characteristics are improved by adding not only the conductor plate 7 but also the conductor plate 8 as the non-exciting element 6.

  As apparent from the above, according to the first embodiment, the inverted L-shaped antenna conductor 3 installed vertically on the ground conductor plate 1 and installed in the vicinity of the antenna conductor 3 and the ground conductor plate 1. Since it is composed of the non-exciting element 6 which is an L-shaped conductor plate, there is an effect that a small antenna device can be obtained that can sufficiently reduce the characteristic deterioration due to the change in the antenna surrounding structure.

Embodiment 2. FIG.
In the first embodiment, the linear conductor 5 constituting the antenna conductor 3 is shown to be installed substantially in parallel with the ground conductor plate 1, but on the side not connected to the linear conductor 4. The end portion of the linear conductor 5 may be bent toward the ground conductor plate 1 so that the end portion is installed substantially perpendicular to the ground conductor plate 1.
FIG. 4 is a perspective view showing an antenna device according to Embodiment 2 of the present invention, in which the end of the linear conductor 5 is bent toward the ground conductor plate 1 and the end is substantially perpendicular to the ground conductor plate 1. is set up.

A monopole antenna such as the inverted L-shaped antenna conductor 3 is equivalently represented by a series resonance circuit of an inductance L and a capacitance C. By increasing the inductance L or the capacitance C, the resonance frequency is lowered. The antenna conductor 3 can be reduced in size.
In the inverted L-shaped antenna conductor 3, the portion where the electric field between the ground conductor plate 1 is strongest is the tip.
Therefore, the parasitic capacitance between the tip of the antenna conductor 3 and the ground conductor plate 1 can be increased by bending the end portion of the linear conductor 5 that is not connected to the linear conductor 4 and bringing it close to the ground conductor plate 1. Therefore, the antenna conductor 3 can be reduced in size.

  As is apparent from the above, according to the second embodiment, the end of the linear conductor 5 that is not connected to the linear conductor 4 is bent toward the ground conductor plate 1 and the end is grounded. Since it is configured to be installed substantially perpendicular to the conductor plate 1, the same effect as in the first embodiment can be obtained, and the antenna conductor 3 can be made smaller than the first embodiment. There is an effect that can be done.

Embodiment 3 FIG.
In the second embodiment, the end of the linear conductor 5 that is not connected to the linear conductor 4 is bent to the ground conductor plate 1 side. However, the antenna conductor 3 is configured. The linear conductors 4 and 5 may be plate-shaped conductors having a predetermined width.
FIG. 5 is a perspective view showing an antenna apparatus according to Embodiment 3 of the present invention, and the linear conductors 4 and 5 are plate-like conductors having a predetermined width.

In the third embodiment, the linear conductors 4 and 5 are constituted by plate-like conductors having a predetermined width, but the band can be widened as the conductor width of the antenna conductor 3 is increased. Moreover, mechanical strength can be made high by making the antenna conductor 3 into plate shape.
Therefore, according to the third embodiment, in addition to obtaining the same effect as in the first and second embodiments, the band can be made wider than in the first and second embodiments, and the mechanical There exists an effect which can make intensity | strength high.

Embodiment 4 FIG.
6 is a perspective view showing an antenna apparatus according to Embodiment 4 of the present invention. In the figure, the same reference numerals as those in FIG.
However, in the fourth embodiment, the feeding point 2 constitutes the first feeding point, and the antenna conductor 3 constitutes the first antenna conductor.

In addition to the feeding point 2 for exciting the antenna conductor 3, the ground conductor plate 1 is provided with a feeding point 12 (second feeding point) for exciting the antenna conductor 13 in the vicinity of the conductor plate 8.
The antenna conductor 13 which is the second antenna conductor is composed of a linear conductor 14 and a linear conductor 15, and one end of the linear conductor 14 which is the third linear conductor is connected to the feeding point 12. It is installed perpendicular to the ground conductor plate 1. Here, an example in which the linear conductor 14 is installed perpendicular to the ground conductor plate 1 is shown, but it may not be completely vertical, for example, even if installed at an angle of about 80 degrees, Similar effects can be obtained.
One end of the linear conductor 15, which is the fourth linear conductor, is connected to the other end of the linear conductor 14, and is installed in parallel to the ground conductor plate 1. Here, an example in which the linear conductor 15 is installed in parallel with the ground conductor plate 1 is shown. However, the linear conductor 15 does not have to be perfectly parallel. For example, even if it is installed at an angle of about 10 degrees, Similar effects can be obtained.

  The antenna conductor 13 is installed in parallel with the antenna conductor 3 with a predetermined interval A. However, the antenna conductor 3 and the antenna conductor 13 do not have to be completely parallel. For example, even if they are installed at an angle of about 10 degrees, substantially the same effect can be obtained.

The conductor plate 8 constituting the non-excitation element 6 is disposed substantially perpendicular to the conductor plate 7 and perpendicular to the linear conductors 5 and 15 so as to substantially cover the linear conductors 4 and 14.
Also in the fourth embodiment, as in the second embodiment, the ends of the linear conductors 5 and 15 that are not connected to the linear conductors 4 and 14 are bent toward the ground conductor plate 1 side.
Similarly to the third embodiment, the linear conductors 4, 5, 14, and 15 constituting the antenna conductors 3 and 13 are plate-shaped conductors having a predetermined width.
However, it is not essential that the end portions of the linear conductors 5 and 15 are bent toward the ground conductor plate 1 side, and may not be bent as in the first embodiment.
Further, the linear conductors 4, 5, 14, and 15 are not necessarily plate-shaped conductors having a predetermined width, and may be rod-shaped conductors as in the first embodiment.

In the antenna device of the fourth embodiment, the number of antennas is two, but the number of non-exciting elements 6 is one, and the non-exciting elements 6 are shared by the antenna conductors 3 and 13.
Therefore, when two antennas are required, for example, the installation of one antenna device of FIG. 6 is more effective for the entire antenna including the non-excitation element 6 than the installation of two antenna devices of FIG. The size can be reduced.

  In addition, by increasing the number of antennas, diversity and MIMO (Multiple Input Multiple Output) can be applied to achieve higher speed / higher quality of the wireless communication system.

However, in the antenna apparatus of FIG. 6, the antenna conductor 3 and the antenna conductor 13 are installed in parallel with a predetermined interval A. However, when the interval A becomes smaller, coupling between antennas becomes stronger and communication performance deteriorates. Sometimes.
Therefore, it is desirable that the distance A between the antenna conductor 3 and the antenna conductor 13 be as wide as possible.
In the example of FIG. 6, the antenna conductor 3 and the antenna conductor 13 have the same shape, but the antenna conductor 3 and the antenna conductor 13 do not have to have the same shape.

Embodiment 5 FIG.
FIG. 7 is a perspective view showing an antenna apparatus according to Embodiment 5 of the present invention.
In the figure, a ground conductor plate 21 is a flat rectangular conductor plate and is disposed on a dielectric substrate 20.
The ground conductor plate 21 has four slots 22a, 22b, 22c, and 22d that are smaller than the wavelength λ of the operating frequency.
The land conductor 23a which is the first land conductor is installed in the slot 22a, and the feeding point 24 which is the first feeding point for exciting the antenna conductor 26 is provided between the ground conductor plate 21 and the land conductor 23a. It has been.
The land conductor 23b which is the second land conductor is installed in the slot 22b, and a feeding point 25 which is a second feeding point for exciting the antenna conductor 30 is provided between the ground conductor plate 21 and the land conductor 23b. It has been.
The land conductor 23c, which is the third land conductor, is installed in the slot 22c, and the land conductor 23d, which is the fourth land conductor, is installed in the slot 22d.

The antenna conductor 26 that is the first antenna conductor includes a linear conductor 27, a linear conductor 28, and a linear conductor 29.
One end of the linear conductor 27 which is the first linear conductor is connected to the land conductor 23 a and is installed perpendicular to the ground conductor plate 21.
One end of the linear conductor 28, which is the second linear conductor, is connected to the land conductor 23 c and installed perpendicular to the ground conductor plate 21. Here, an example in which the linear conductors 27 and 28 are installed perpendicular to the ground conductor plate 21 is shown, but it may not be completely perpendicular, for example, it may be installed at an angle of about 80 degrees. A substantially similar effect can be obtained.
The linear conductor 29 that is the third linear conductor has one end connected to the other end of the linear conductor 27 and the other end connected to the other end of the linear conductor 28.
FIG. 7 shows an example in which the linear conductors 27, 28, and 29 are plate-like conductors having a predetermined width in order to widen the band of the antenna conductor 26 and increase the mechanical strength. .
However, it is not essential that the linear conductors 27, 28, and 29 are plate-like conductors, and may be rod-like conductors.

  The antenna conductor 30 as the second antenna conductor is composed of a linear conductor 31, a linear conductor 32, and a linear conductor 33, and is installed in parallel to the antenna conductor 26 with a predetermined interval. However, the antenna conductor 26 and the antenna conductor 30 do not have to be completely parallel. For example, even if the antenna conductor 26 and the antenna conductor 30 are installed at an angle of about 10 degrees, substantially the same effect can be obtained.

One end of the linear conductor 31 which is the fourth linear conductor is connected to the land conductor 23 b and installed perpendicular to the ground conductor plate 21.
One end of the linear conductor 32 that is the fifth linear conductor is connected to the land conductor 23 d and is installed perpendicular to the ground conductor plate 21. Here, an example in which the linear conductors 31 and 32 are installed perpendicular to the ground conductor plate 21 is shown, but it may not be completely vertical, for example, it may be installed at an angle of about 80 degrees. A substantially similar effect can be obtained.
The linear conductor 33 which is the sixth linear conductor has one end connected to the other end of the linear conductor 31 and the other end connected to the other end of the linear conductor 32.
FIG. 7 shows an example in which the linear conductors 31, 32, and 33 are plate-shaped conductors having a predetermined width in order to widen the band of the antenna conductor 30 and increase the mechanical strength. .
However, it is not essential that the linear conductors 31, 32, and 33 are plate-like conductors, and may be rod-like conductors.

The non-excitation element 34 includes a planar rectangular conductor plate 35 and a planar rectangular conductor plate 36, and the conductor plate 35, which is the first conductor plate, is an antenna among the surfaces of the ground conductor plate 21. On the surface opposite to the surface on which the conductors 26 and 30 are disposed, the ground conductor plate 21 is disposed in parallel with the ground conductor plate 21 so as to substantially cover the ground conductor plate 21 with a predetermined interval. Here, an example in which the conductor plate 35 is installed in parallel with the ground conductor plate 21 is shown. However, the conductor plate 35 may not be completely parallel. For example, the conductor plate 35 is almost the same even if installed at an angle of about 10 degrees. The effect of can be obtained.
The conductor plate 36 as the second conductor plate has one side connected to one side of the conductor plate 35 and is perpendicular to the conductor plate 35 so as to substantially cover the linear conductors 27 and 31, and the linear conductors 29 and 33. And installed vertically. Here, an example is shown in which the conductor plate 36 is installed perpendicularly to the conductor plate 35 and the linear conductors 29, 33, but it may not be completely vertical, for example, installed at an angle of about 80 degrees. Even in this case, substantially the same effect can be obtained.

  FIG. 7 shows an example in which the feeding points 24 and 25 are installed in the vicinity of the vertex of the rectangular ground conductor plate 21. However, the feeding points 24 and 25 may be installed in the vicinity of the conductor plate 36. For example, any position on the ground conductor plate 21 may be used.

Next, the operation will be described.
When power is supplied to the antenna conductor 26 from the feeding point 24 and the antenna conductor 26 is excited, current flows through the linear conductors 27, 28, 29 and the ground conductor plate 21, and electromagnetic waves are radiated.
Similarly, when power is supplied to the antenna conductor 30 from the feeding point 25 and the antenna conductor 30 is excited, current flows through the linear conductors 31, 32, 33 and the ground conductor plate 21, and electromagnetic waves are radiated.
In the antenna apparatus of FIG. 7, since the antenna conductors 26 and 30 are installed apart from the conductor plate 35, an antenna having a relatively wide band and high radiation efficiency can be obtained.

In the antenna device of FIG. 7, the conductor plate 35 is installed in parallel with the polarized waves radiated from the linear conductors 29 and 33 and the ground conductor plate 21, and is parallel to the polarized waves radiated from the linear conductors 27 and 31. A conductor plate 36 is installed on the surface.
Therefore, the antenna conductors 26 and 30 and the ground conductor plate 21 are strongly coupled to the non-excitation element 34, and the non-excitation element 34 operates as a reflector. For this reason, radiation directivity can be directed to the opposite side to the non-excitation element 34, and radiation to the non-excitation element 34 side can be sufficiently reduced.

Here, in the antenna device of FIG. 7, the length of the conductor plate 35 is P1, the height of the conductor plate 36 is P2, the width of the conductor plates 35 and 36 is W, and the distance between the ground conductor plate 21 and the conductor plate 35 is set. D1, the distance between the linear conductors 27 and 31 and the conductor plate 36 is D2. Further, the wavelength at the center frequency of the frequency band in which the antenna is used is λ.
At this time, the lengths P1 + P2 of the non-excitation elements 34, the distance D1 between the ground conductor plate 21 and the conductor plate 35, and the distance D2 between the linear conductors 27, 31 and the conductor plate 36 are changed to change the antenna conductors 26, 30. In addition, by adjusting the coupling amount from the ground conductor plate 21 to the non-excitation element 34, the radiation directivity can be directed to the opposite side to the non-excitation element 34 as in the first embodiment.

When the width W of the conductor plates 35 and 36 is small, when the length P1 + P2 of the non-excitation element 34 is about 0.5λ, the non-excitation element 34 resonates and operates as a reflector.
However, when the width W of the conductor plates 35 and 36 is large, the length P1 + P2 of the non-excitation element 34 necessary for resonance becomes smaller than 0.5λ.

  As is apparent from the above, according to the fifth embodiment, the antenna conductors 26 and 30 are formed in a U shape and are connected to the land conductors 23 a to 23 d on the dielectric substrate 20. In addition to the same effects as those of the first to fourth embodiments, the mechanical strength of the antenna conductors 26 and 30 can be improved to improve the ease of manufacturing.

Further, according to the fifth embodiment, by adjusting the distance between the land conductor 22c and the ground conductor plate 21 at the end portion of the antenna conductor 26, the parasitic capacitance between the end portion of the antenna conductor 26 and the ground conductor plate 21 is reduced. Since the size can be increased, the antenna conductor 26 can be reduced in size.
Similarly, by adjusting the distance between the land conductor 22d and the ground conductor plate 21 at the end portion of the antenna conductor 30, the parasitic capacitance between the end portion of the antenna conductor 30 and the ground conductor plate 21 can be increased. Miniaturization can be achieved.

In the fifth embodiment, the lengths of the linear conductor 27 and the linear conductor 28 constituting the antenna conductor 26 are equal, and the linear conductor 31 and the linear conductor constituting the antenna conductor 30 are the same. Although the lengths of 32 are equal, these lengths do not have to be equal. For example, the length of the linear conductor 27 may be longer than the length of the linear conductor 28 as shown in FIG. . Conversely, the length of the linear conductor 27 may be shorter than the length of the linear conductor 28.
Similarly, the length of the linear conductor 31 may be longer than the length of the linear conductor 32, or the length of the linear conductor 31 may be shorter than the length of the linear conductor 32.

FIG. 9 shows the surface of the conductor plate 35 opposite to the surface on which the antenna conductors 26 and 30 are installed, and the surface of the conductor plate 36 on which the antenna conductors 26 and 30 are installed. It is a perspective view which shows the state in which the apparatus 10 (The apparatus comprised from both a metal body and a dielectric material or a metal body and a dielectric material) is installed in the surface opposite to this surface.
Also in this case, as shown in the first embodiment, by installing the non-excitation element 34, the radiation directivity is directed to the opposite side to the non-excitation element 34, and the deterioration of the radiation efficiency due to the influence of the device 10 is reduced. can do.

  In the fifth embodiment, the ground conductor plate 21 is provided on the upper surface of the dielectric substrate 20. However, a part of the ground conductor plate 21 is an inner layer of the dielectric substrate 20 or a dielectric material. It is installed on the lower surface of the substrate 30 (the surface on which the antenna conductors 26 and 30 are not installed), and a part of the ground conductor plate 21 and the ground conductor plate 21 installed on the upper surface of the dielectric substrate 20. However, they may be connected by through holes, and the same effect can be obtained.

  In the first to fifth embodiments, the ground conductor plates 1 and 21 and the conductor plates 7, 8, 35, and 36 have a rectangular shape. However, the shape is not necessarily a complete rectangle. Or a hole or the like.

  In the present invention, within the scope of the invention, any combination of the embodiments, or any modification of any component in each embodiment, or omission of any component in each embodiment is possible. .

  1 ground conductor plate, 2 feeding point (first feeding point), 3 antenna conductor (first antenna conductor), 4 linear conductor (first linear conductor), 5 linear conductor (second linear shape) Conductor), 6 non-exciting element, 7 conductor plate (first conductor plate), 8 conductor plate (second conductor plate), 10 device, 12 feeding point (second feeding point), 13 antenna conductor (second Antenna conductor), 14 linear conductor (third linear conductor), 15 linear conductor (fourth linear conductor), 20 dielectric substrate, 21 ground conductor plate, 22a, 22b, 22c, 22d slot, 23a Land conductor (first land conductor), 23b Land conductor (second land conductor), 23c Land conductor (third land conductor), 23d Land conductor (fourth land conductor), 24 Feed point (first Feeding point), 25 feeding point (second feeding point), 2 Antenna conductor (first antenna conductor), 27 linear conductor (first linear conductor), 28 linear conductor (second linear conductor), 29 linear conductor (third linear conductor), 30 Antenna conductor (second antenna conductor), 31 linear conductor (fourth linear conductor), 32 linear conductor (fifth linear conductor), 33 linear conductor (sixth linear conductor), 34 Non-excitation element, 35 conductor plate (first conductor plate), 36 conductor plate (second conductor plate).

Claims (11)

A planar ground conductor plate;
One end is connected to a feeding point installed on the ground conductor plate, the first linear conductor is installed substantially perpendicular to the ground conductor plate, and one end is the other of the first linear conductor. An antenna conductor composed of a second linear conductor connected to the end and disposed substantially parallel to the ground conductor plate;
Of the surface of the ground conductor plate, on the surface opposite to the surface on which the antenna conductor is installed, a planar shape installed substantially parallel to the ground conductor plate with a predetermined distance from the ground conductor plate A first conductor plate of
An antenna having one side connected to one side of the first conductor plate and a planar second conductor plate installed substantially perpendicular to the first conductor plate and the second linear conductor apparatus.   The other end of the second linear conductor constituting the antenna conductor is bent toward the ground conductor plate, and the other end is installed substantially perpendicular to the ground conductor plate. Antenna device.   3. The antenna device according to claim 1, wherein the first and second linear conductors constituting the antenna conductor are plate-shaped conductors having a predetermined width. A planar ground conductor plate;
One end is connected to a first feeding point installed on the ground conductor plate, the first linear conductor is installed substantially perpendicular to the ground conductor plate, and one end is the first linear shape. A first antenna conductor connected to the other end of the conductor and composed of a second linear conductor installed substantially parallel to the ground conductor plate;
One end is connected to a second feeding point installed on the ground conductor plate, a third linear conductor is installed substantially perpendicular to the ground conductor plate, and one end is the third linear shape. A second antenna conductor connected to the other end of the conductor and composed of a fourth linear conductor installed substantially parallel to the ground conductor plate;
Installed on the surface of the ground conductor plate opposite to the surface on which the first and second antenna conductors are installed with a predetermined distance from the ground conductor plate and substantially parallel to the ground conductor plate. A planar first conductor plate,
A planar second conductor plate having one side connected to one side of the first conductor plate and disposed substantially perpendicular to the first conductor plate and the second and fourth linear conductors; Antenna device provided. The other end of the second linear conductor constituting the first antenna conductor is bent toward the ground conductor plate, and the other end is installed substantially perpendicular to the ground conductor plate.
The other end of the fourth linear conductor constituting the second antenna conductor is bent toward the ground conductor plate, and the other end is installed substantially perpendicular to the ground conductor plate. The antenna device according to claim 4.   The first and second linear conductors constituting the first antenna conductor are plate-like conductors having a predetermined width, and the third and fourth lines constituting the second antenna conductor 6. The antenna device according to claim 4, wherein the conductor is a plate-like conductor having a predetermined width. A planar ground conductor plate installed on a dielectric substrate;
Four slots smaller than the wavelength of the operating frequency that is vacated in the ground conductor plate;
First, second, third and fourth land conductors respectively installed in the four slots;
One end connected to the first land conductor, the first linear conductor installed substantially perpendicular to the ground conductor plate, and one end connected to the third land conductor, the ground conductor plate A second linear conductor installed substantially perpendicular to the first linear conductor, one end connected to the other end of the first linear conductor, and the other end connected to the other end of the second linear conductor. A first antenna conductor composed of a third linear conductor,
One end connected to the second land conductor and a fourth linear conductor installed substantially perpendicular to the ground conductor plate, and one end connected to the fourth land conductor and the ground conductor plate A fifth linear conductor installed substantially perpendicularly, one end connected to the other end of the fourth linear conductor, and the other end connected to the other end of the fifth linear conductor. A second antenna conductor disposed substantially parallel to the first antenna conductor at a predetermined interval from the first antenna conductor,
A plane that is disposed on the surface of the dielectric substrate opposite to the surface on which the ground conductor plate is installed, and substantially parallel to the ground conductor plate with a predetermined distance from the dielectric substrate. A first conductive plate having a shape;
One side is connected to one side of the first conductor plate, and the first conductor plate, the planar second conductor plate installed substantially perpendicular to the third and sixth linear conductors, Prepared,
A first feeding point for exciting the first antenna conductor is provided between the ground conductor plate and the first land conductor, and a second feeding point for exciting the second antenna conductor is the ground conductor. An antenna device, wherein the antenna device is provided between a plate and the second land conductor.   The first, second, and third linear conductors constituting the first antenna conductor are plate-like conductors having a predetermined width, and the fourth, second, and the second antenna conductors are constituted. 8. The antenna device according to claim 7, wherein the fifth and sixth linear conductors are plate-like conductors having a predetermined width.   A part of the ground conductor plate is disposed on the inner layer of the dielectric substrate, or on the surface of the dielectric substrate on the side where the first and second antenna conductors are not disposed. 9. The antenna device according to claim 7, wherein the ground conductor plates installed on the dielectric substrate are connected by through holes.   Of the surface of the first conductor plate, the surface opposite to the surface on which the antenna conductor is installed, and among the surface of the second conductor plate, the surface opposite to the surface on which the antenna conductor is installed 10. A device according to any one of claims 1 to 9, wherein a device comprising a metal body, a dielectric body, or both a metal body and a dielectric body is installed. Antenna device.   When the length of the side substantially perpendicular to the second conductive plate in the first conductive plate is P1, and the length of the side substantially perpendicular to the first conductive plate in the second conductive plate is P2, P1 11. The antenna device according to claim 1, wherein a sum of P2 and P2 is equal to or less than a half wavelength.

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